TangentSpaceGenerator.h

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGUTIL_TANGENTSPACEGENERATOR_
#define OSGUTIL_TANGENTSPACEGENERATOR_

#include <osgUtil/Export>

#include <osg/ref_ptr>
#include <osg/Referenced>
#include <osg/Array>
#include <osg/Geometry>

namespace osgUtil
{

class OSGUTIL_EXPORT TangentSpaceGenerator: public osg::Referenced {
public:
    TangentSpaceGenerator();
    TangentSpaceGenerator(const TangentSpaceGenerator &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY);

    void generate(osg::Geometry *geo, int normal_map_tex_unit = 0);

    inline osg::Vec4Array *getTangentArray()               { return T_.get(); }
    inline const osg::Vec4Array *getTangentArray() const   { return T_.get(); }
    inline void setTangentArray(osg::Vec4Array *array)     { T_ = array; }

    inline osg::Vec4Array *getNormalArray()                { return N_.get(); }
    inline const osg::Vec4Array *getNormalArray() const    { return N_.get(); }
    inline void setNormalArray(osg::Vec4Array *array)      { N_ = array; }

    inline osg::Vec4Array *getBinormalArray()              { return B_.get(); }
    inline const osg::Vec4Array *getBinormalArray() const  { return B_.get(); }
    inline void setBinormalArray(osg::Vec4Array *array)    { B_ = array; }

    inline osg::IndexArray *getIndices() { return indices_.get(); }

protected:

    virtual ~TangentSpaceGenerator() {}
    TangentSpaceGenerator &operator=(const TangentSpaceGenerator &) { return *this; }

    void compute(osg::PrimitiveSet *pset,
                 const osg::Array *vx,
                 const osg::Array *nx,
                 const osg::Array *tx,
                 int iA, int iB, int iC);

    osg::ref_ptr<osg::Vec4Array> T_;
    osg::ref_ptr<osg::Vec4Array> B_;
    osg::ref_ptr<osg::Vec4Array> N_;
    osg::ref_ptr<osg::UIntArray> indices_;
};

}

#endif